Get a scope for the default primary weapon and C4... This is not a run-and-gun, or spray-and-pray class.
Use the primary weapon to engage lone targets, or as a light suppression system in hard to reach areas. Use the C4 by dropping onto unsuspecting vehicles, and detonating. (you can take out anything with 1-3 direct hits on the top of the vehicle, but you're likely to die doing so)
Get a 3.4-4x scope, advanced foregrip, and High Velocity Ammo for the NC6 Gauss SAW that you get by default, and never try to hipfire with it unless the enemy is within 10 feet of you. This weapon is designed for short-medium to medium-long ranges, and is primarily a suppression weapon. (your aim is to wound, slow, and pin down the enemy with this weapon, not kill) If you want stealthy kills with it, get a suppressor, otherwise get the compensator. When fully upgraded in this way, it is the least expensive top-tier capable weapon in the game.
You can also turn this class into a counter-sniper system by getting the Warden. (combat medic and engineer can use it as well) It is semi-automatic, but if you put a 4x or 6x scope on it and High Velocity Ammo, you can use it to 2-shot 99% of snipers at up to very-long range. Standard method to engage: Put up shield, (use Nanite Mesh shield) leave cover, put two semi-rapid shots into the location the sniper is located at, reenter cover, drop shield, wait for shield to regenerate, repeat until sniper dies. If done right, there is no way you will lose vs a single sniper. If you're against multiple snipers, only leave cover far enough to be visible to 1 sniper.
The trick is to get in position, drop cloak just before firing, then move behind cover, cloak, and move to different cover. (there are a LOT of people that can really ruin a good firefight with very little skill, so it's obviously not broken) If you're using the same cover more than once, you're doing it wrong, and deserve every death.
I highly recommend immediately upgrading to the AF-6 Shadow, unless you intend on using the Stalker Cloak. (which prevents the use of your primary weapon) Put a 3.4-4x scope on it, and you're good to start semi-auto sniping.
If you prefer bolt-action sniping, the only weapon that can guarantee a 1-hit kill on any non-MAX or non-shielded Heavy is the EM4 Longshot.
The default weapon for this class is the AF-19 Mercenary... It is a good weapon when you put a light scope on it.
If you're planning on close-quarters combat, I would suggest getting the Blitz GD-10 though. It is a superior CQB hipfire weapon.
Medic is usually the most targeted enemy class. If you choose medic, bear in mind that you are NOT a frontline shooter. You will die fast, and often. You will only get lots of points if you have great cover, and a lot of people being injured/killed around you. Rez people only if they are outside the line of fire, otherwise you'll have wasted your rez charge to either give points to the enemy, or on a guy smart enough to not accept the rez.
I very much like the Heavy Assault class, simply because of the extremely capable weapons, variety of uses, and overall durability of the class when compared to others... However you should go to the VR training range, and learn what class suits you best before purchasing anything. (in the VR range, everything is completely free, so you can try everything to see what you like most)
